Big Brother really was watching him - and it cost him his job. Now the state Labor Department supervisor who got the boot for faking timesheets and travel records is suing to get his post back, saying investigators had no right to slap a GPS monitoring device on his personal car. The New York Civil Liberties Union is carrying the torch for ousted Michael Cunningham, who was canned in August. Their suit says the department's use of GPS without a warrant violated Cunningham's constitutional right to be free of unreasonable searches. "Your boss can't sit in the backseat of your car and watch you, your wife and your children 24 hours a day, but that's exactly what the Department of Labor did to Mr. Cunningham," said the NYCLU's Donna Lieberman.